Jared Kushner's finances and business dealings are now a focus of the Trump-Russia investigation

The business dealings of Jared Kushner have become a focus in special counsel Robert Mueller's investigation into Russian interference in the 2016 election, according to a Washington Post report Thursday night.

Kushner, the adviser and son-in-law of President Donald Trump, met separately with the Russian ambassador to the U.S. and a Russian businessman in December — interactions that were already under scrutiny as part of the FBI probe.

Sources informed The Post of the financial focus of the investigation.

During the meeting at Trump Tower with the Russian ambassador, Sergey Kislyak, Kushner reportedly floated the possibility of establishing a back-channel line of communication between the Trump transition team and Russia.

Ivanka Trump, daughter of US President Donald Trump, her husband Jared Kushner, senior adviser to Trump step off Air Force One upon arrival at Rome's Fiumicino Airport on May 23, 2017. Donald Trump arrived in Rome for a high-profile meeting with Pope Francis in what was his first official trip to Europe since becoming US President. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US President Donald Trump (L) and White House senior advisor Jared Kushner take part in a bilateral meeting with Italy's Prime Minister Paolo Gentiloni (not seen) in Villa Taverna, the US ambassador's residence, in Rome on May 24, 2017.
After a private audience wit Pope Francis early in the morning Trump's family will fly to Brussels this afternoon for meetings with EU and NATO officials before returning to Italy for the G7 summit in Sicily on May 26-27. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

WASHINGTON, DC - JANUARY 20: Ivanka Trump, with her husband Jared Kushner and their children, depart after her father President Donald Trump formally signed his cabinet nominations into law, in the President's Room of the Senate, at the Capitol in Washington, January 20, 2017. (Photo by J. Scott Applewhite - Pool/Getty Images)

NEW YORK, NY - APRIL 1: (L-R) Josh Kushner, Charles Kushner and Jared Kushner attend The New York Observer's New Look Hosted by Jared Kushner and Joseph Meyer at Casa Lever on April 1, 2014 in New York. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)

NEWARK, NJ - AUGUST 18: Charles Kushner (C) wades though the media with his legal team and wife to the U.S. District Courthouse August 18, 2004 in Newark, New Jersey. Kushner, a New Jersey developer and a major campaign contributors to Democrats including embattled Gov. Jim McGreevey, is expected to plead guilty to federal charges that he hired a prostitute to try to silence a witness in a federal investigation. (Photo by Chris Hondros/Getty Images)

NEW YORK CITY, NY - JUNE 14: (L-R) Charles Collier, Arianna Huffington and Jared Kushner attend AMC Hosts a Special Preview and Discussion of Their Provocative New Series 'MAD MEN' at Michael's on June 14, 2007 in New York City. (Photo by JIMI CELESTE/Patrick McMullan via Getty Images)

Ivanka Trump (C) and White House senior advisor Jared Kushner (R) listen to the US president delivering a speech during a visit to the Yad Vashem Holocaust Memorial museum, commemorating the six million Jews killed by the Nazis during World War II, on May 23, 2017, in Jerusalem. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

NEW YORK, NEW YORK - JUNE 4: (L-R) Josh Kushner, Jared Kushner, Barry Diller and Wendi Murdoch attend FOUNDERS CLUB New York & BARRY DILLER welcome TIM ARMSTRONG & JON MILLER at Roof Garden on June 4, 2008 in New York. (Photo by DAVID X PRUTTING/Patrick McMullan via Getty Images)

WEST PALM BEACH, FL - FEBRUARY 10: Jared Kushner and his wife Ivanka Trump walk off Air Force One with their children at Palm Beach International airport as they prepare to spend part of the weekend together with her father President Donald Trump at Mar-a-Lago resort on February 10, 2017 in West Palm Beach, Florida. President Trump is hosting Japanese Prime Minister Shinzo Abe and are scheduled to get in a game of golf as well as discuss trade issues. (Photo by Joe Raedle/Getty Images)

NEW YORK, NY - MARCH 14: (L-R) Josh Raffel, Jared Kushner and Matthew Hiltzik attend The New York Observer 25th Anniversary at Four Seasons Restaurant on March 14, 2013 in New York City. (Photo by Paul Bruinooge/Patrick McMullan via Getty Images)

NEW YORK, NY - APRIL 1: (L-R) Anthony Marx, Jared Kushner, Joseph Meyer and Josh Kushner attend The New York Observer's New Look Hosted by Jared Kushner and Joseph Meyer at Casa Lever on April 1, 2014 in New York City. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)

Ivanka Trump, daughter of US President Donald Trump, her husband Jared Kushner, senior adviser to Trump, and their children walk off Air Force One at Palm Beach International Airport in Florida as they arrive to spend the weekend at Trump's Mar-a-Lago resort on February 10, 2017 with Japanese Peime Minister Shinzo Abe and his wife Akie. / AFP / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

WASHINGTON, DC - MAY 31: White House senior adviser Jared Kushner looks on during a meeting between President Donald Trump and Prime Minister Nguyen Xuan Phuc of Vietnam in the Cabinet Room of the White House, on May 31, 2017 in Washington, DC. (Photo by Olivier Douliery-Pool/Getty Images)

VATICAN CITY, VATICAN - MAY 24: Jared Kushner, Senior Adviser to US President arrives with the delegation of President of United States of America Donald Trump and Wife Melania Trump for a meeting with Pope Francis, on May 22, 2017 in Vatican City, Vatican. (Photo by (Photo by Vatican Pool - Corbis/Corbis via Getty Images)

VATICAN CITY, VATICAN - MAY 24: Ivanka Trump and Jared Kushner attend an audience with Pope Francis at the Apostolic Palace on May 24, 2017 in Vatican City, Vatican. The President Trump will return on Italy on Friday attending the Group of 7 Summit in Sicily. (Photo by Vatican Pool/Getty Images)

WASHINGTON, DC - JANUARY 21: Ivanka Trump and her husband Jared Kushner attend the National Prayer Service at the National Cathedral, on January 21, 2017 in Washington, DC. (Photo by Mark Wilson/Getty Images)

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The White House has said that Kushner's subsequent meeting with Sergey Gorkov, CEO of Russia's state-owned Vnesheconombank, was unrelated to business matters. But the FBI is looking into whether Gorkov suggested to Kushner that Russian banks could finance the business ventures of Trump's associates if U.S. sanctions were lifted or relaxed.

Kushner attorney Jamie Gorelick pushed back on the report in a statement Thursday evening.

"We do not know what this report refers to," Gorelick said. "It would be standard practice for the Special Counsel to examine financial records to look for anything related to Russia. Mr. Kushner previously volunteered to share with Congress what he knows about Russia-related matters. He will do the same if he is contacted in connection with any other inquiry."

The development marks another expansion of the FBI probe, whose scope had previously been limited to uncovering whether Trump's campaign colluded with the Kremlin during the 2016 election. The Post reported on Wednesday that Mueller was investigating Trump to prove whether the president attempted to obstruct justice.

In an early-morning tweetstorm, Trump blasted the investigation as a "witch hunt" and a "phony story."

"You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people!" Trump said in a tweet.

You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people! #MAGA

According to Thursday's Post report, investigators have also been looking into the financial dealings of other Trump associates, including former National Security Adviser Michael Flynn, Trump's former campaign chairman Paul Manafort, and former foreign-policy adviser Carter Page.